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8b5eb68238
They can be close()d explicitly with close-file-descriptor, and will close() on gc, but only explicitly closing the last port on them will close the fileno. Notably needed for network sockets where we open separate input and output ports on the same socket.
70 lines
2.4 KiB
Scheme
70 lines
2.4 KiB
Scheme
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; File: destruct.sch
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; Description: DESTRUCTIVE benchmark from Gabriel tests
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; Author: Bob Shaw, HPLabs/ATC
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; Created: 8-Apr-85
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; Modified: 10-Apr-85 14:54:12 (Bob Shaw)
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; 23-Jul-87 (Will Clinger)
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; 22-Jan-88 (Will Clinger)
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; Language: Scheme
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; Status: Public Domain
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; append! is no longer a standard Scheme procedure, so it must be defined
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; for implementations that don't already have it.
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(define (my-append! x y)
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(if (null? x)
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y
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(do ((a x b)
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(b (cdr x) (cdr b)))
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((null? b)
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(set-cdr! a y)
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x))))
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;;; DESTRU -- Destructive operation benchmark
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(define (destructive n m)
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(let ((l (do ((i 10 (- i 1))
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(a '() (cons '() a)))
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((= i 0) a))))
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(do ((i n (- i 1)))
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((= i 0))
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(cond ((null? (car l))
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(do ((l l (cdr l)))
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((null? l))
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(or (car l)
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(set-car! l (cons '() '())))
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(my-append! (car l)
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(do ((j m (- j 1))
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(a '() (cons '() a)))
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((= j 0) a)))))
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(else
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(do ((l1 l (cdr l1))
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(l2 (cdr l) (cdr l2)))
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((null? l2))
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(set-cdr! (do ((j (quotient (length (car l2)) 2) (- j 1))
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(a (car l2) (cdr a)))
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((zero? j) a)
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(set-car! a i))
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(let ((n (quotient (length (car l1)) 2)))
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(cond ((= n 0) (set-car! l1 '())
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(car l1))
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(else
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(do ((j n (- j 1))
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(a (car l1) (cdr a)))
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((= j 1)
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(let ((x (cdr a)))
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(set-cdr! a '())
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x))
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(set-car! a i))))))))))))
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;;; call: (destructive 600 50)
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(let ((input (with-input-from-file "input.txt" read)))
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(time (let loop ((n 10) (v 0))
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(if (zero? n)
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'v
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(loop (- n 1)
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(destructive (if input 600 0) 500))))))
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